This is the stock clutch disc for the Ford 1600 Kent engine, as used on the Cortina. Many Formula Fords still use this clutch, particularly in series that use a standing start. The sprung hub and marcel make the stock clutch much easier to modulate than most racing clutches.
Friction surface width: 1 1/16"
Spline: 7/8" x 20
Thickness (new): 5/16"
Thickness (minimum): 7/32"
This disc does not fit racing clutches such as the 7 1/4" Tilton OT-II Racing Clutch.